GTA: War Zomb Avatar

It came like a thief in the night and nobody was prepared, so the virus spreads quickly. It only took a year for it to took over the world. Now, only a few survivor of the zombie apocalypse. Fortunately, these guys are tough and would never quit. But, these things are as real as they can be and courage alone can't handle the problem. They need the best and they would be his follower.
The game setting is in the zombie apocalypse. You need to protect the base and loot whenever possible. The game gets more challenging and harder as you make some progress.